negatively regulates proteasome-mediated ubiquitin-dependent NRF2 catabolic process negative regulation of proteasomal ubiquitin-dependent protein catabolic process negative regulation of proteasomal ubiquitin-dependent NRF2 catabolic process Any process that stops, prevents, or reduces the frequency, rate or extent of the breakdown of NRF2 by hydrolysis of its peptide bonds, initiated by the covalent attachment of ubiquitin, and mediated by the proteasome.